Bit Operations using Macros

Code

#include <stdio.h>
#include <stdint.h>

// Define bitwise macros here

#define SET_2_7(reg) ((reg|=(1<<2))|(reg|=(1<<7)))
#define CLEAR_3(reg) (reg&= ~(1<<3))
#define TOGGLE_5(reg)(reg^=(1<<5))

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    SET_2_7(reg);
    CLEAR_3(reg);
    TOGGLE_5(reg);
    return reg;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", modify_register(reg));
    return 0;
}

Solving Approach